Add OsCommerce AJAX-field for XML-export

My company presently use address information export from osCommerce to our transport company through xml-files. Now we want to use the transport companys new additional possibilities in order to export more information such as quantities, weight, volume, parcel type and name. I also want the labels to be printed without the use of logging into the transport company website. This is done by sending a special code. I want this to be done by adding an AJAX- field to the [login to view URL] page in osCommerse. The additional fields should add the new information to the xml-file that generates everytime you press the "Skicka till Unifaun"-button. Download the attached pdf for images that shows how I want the design to look like. Image 1 shows present look. I can provide with all necessary transport company product codes. Please note that the system works 100% today. I just want more information to be exported!